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On the topology of multicast trees

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2 Author(s)
Chalmers, R.C. ; Dept. of Comput. Sci., Univ. of California, Santa Barbara, CA, USA ; Almeroth, K.C.

The benefit derived from using multicast is seemingly dependent upon the shape of the distribution tree. We attempt to model interdomain multicast trees accurately. We measure a number of key parameters, such as depth, degree frequency, and average degree, for a number of real and synthetic data sets. We find that interdomain multicast trees actually do share a common shape at both the router and autonomous system levels. Furthermore, we develop a characterization of multicast efficiency which reveals that group sizes as small as 20 to 40 receivers offer a 55%-70% reduction in the total number of links traversed when compared to separately delivered unicast streams. A final contribution of our work consists in a number of data sets, compiled from multicast group membership and path data, that can be used to generate large sample trees, representative of the current multicast infrastructure.

Published in:

Networking, IEEE/ACM Transactions on  (Volume:11 ,  Issue: 1 )

Date of Publication:

Feb 2003

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